<!DOCTYPE html>
<html ng-app=''>
  <head>
    <meta charset="utf-8">
    <title></title>
    <script src="angular.js"></script>
    <script type="text/javascript">
    let a=99;

    </script>
  </head>
  <body>
    <input type="text" name="" value="" ng-model='a'>
    <input type="button" name="" value="" onclick="alert(a);">
    {{a}}
  </body>
</html>
